I on the computer when Frank called me last night．（ ）
A．workB．will work
C．was workingD．am working
﹣Do you know ______？﹣Two months ago．（ ）
| A． |
when did he take this photo |
B． |
when he took this photo |
| C． |
where did he take this photo |
D． |
where he took this photo |
﹣﹣Hi，Nancy．What is your brother doing？
﹣﹣He ______ a shower．（ ）
| A． |
is taking |
B． |
was taking |
C． |
took |
D． |
take |
The telephone ______ by Bell in 1876．（ ）
| A． |
will be invented |
B． |
is invented |
| C． |
was inventing |
D． |
was invented |
﹣﹣Tell him ______ tomorrow，please．
﹣﹣OK．（ ）
| A． |
come |
B． |
to come |
C． |
comes |
D． |
coming |
Robots ______ more heavy work for us in the future．（ ）
| A． |
did |
B． |
will do |
C． |
have done |
D． |
were doing |